一个PHP的ZIP压缩类分享

$zipfiles =array("/root/pooy/test1.txt","/root/pooy/test2.txt");
$z = new PHPZip();
//$randomstr = random(8);
$zipfile = TEMP."/photocome_".$groupid.".zip";
$z->Zip($zipfiles,$zipfile); //添加文件列表

#
# PHPZip v1.2 by Sext (sext@neud.net) 2002-11-18
# (Changed: 2003-03-01)
#
# Makes zip archive
#
# Based on "Zip file creation class",uses zLib
#
#
class PHPZip
{
function Zip($dir,$zipfilename)
{
if (@function_exists('gzcompress'))
{
$curdir = getcwd();
if (is_array($dir))
{
$filelist = $dir;
}
else
{
$filelist = $this -> GetFileList($dir);
} if ((!empty($dir))&&(!is_array($dir))&&(file_exists($dir))) chdir($dir);
else chdir($curdir); if (count($filelist)>0)
{
foreach($filelist as $filename)
{
if (is_file($filename))
{
$fd = fopen ($filename,"r");
$content = fread ($fd,filesize ($filename));
fclose ($fd); if (is_array($dir)) $filename = basename($filename);
$this -> addFile($content,$filename);
}
}
$out = $this -> file(); chdir($curdir);
$fp = fopen($zipfilename,"w");
fwrite($fp,$out,strlen($out));
fclose($fp);
}
return 1;
}
else return 0;
}function GetFileList($dir)
{
if (file_exists($dir))
{
$args = func_get_args();
$pref = $args[1]; $dh = opendir($dir);
while($files = readdir($dh))
{
if (($files!=".")&&($files!=".."))
{
if (is_dir($dir.$files))
{
$curdir = getcwd();
chdir($dir.$files);
$file = array_merge($file,$this -> GetFileList("","$pref$files/"));
chdir($curdir);
}
else $file[]=$pref.$files;
}
}
closedir($dh);
}
return $file;
}var $datasec = array();
var $ctrl_dir = array();
var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
var $old_offset = 0;/**
* Converts an Unix timestamp to a four byte DOS date and time format (date
* in high two bytes,time in low two bytes allowing magnitude comparison).
*
* @param integer the current Unix timestamp
*
* @return integer the current date in a four byte DOS format
*
* @access private
*/
function unix2DosTime($unixtime = 0) {
$timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);if ($timearray['year'] < 1980) {
$timearray['year'] = 1980;
$timearray['mon'] = 1;
$timearray['mday'] = 1;
$timearray['hours'] = 0;
$timearray['minutes'] = 0;
$timearray['seconds'] = 0;
} // end ifreturn (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
} // end of the 'unix2DosTime()' method/**
* Adds "file" to archive
*
* @param string file contents
* @param string name of the file in the archive (may contains the path)
* @param integer the current timestamp
*
* @access public
*/
function addFile($data,$name,$time = 0)
{
$name = str_replace('','/',$name);$dtime = dechex($this->unix2DosTime($time));
$hexdtime = 'x' . $dtime[6] . $dtime[7]
. 'x' . $dtime[4] . $dtime[5]
. 'x' . $dtime[2] . $dtime[3]
. 'x' . $dtime[0] . $dtime[1];
eval('$hexdtime = "' . $hexdtime . '";');$fr = "x50x4bx03x04";
$fr .= "x14x00"; // ver needed to extract
$fr .= "x00x00"; // gen purpose bit flag
$fr .= "x08x00"; // compression method
$fr .= $hexdtime; // last mod time and date// "local file header" segment
$unc_len = strlen($data);
$crc = crc32($data);
$zdata = gzcompress($data);
$c_len = strlen($zdata);
$zdata = substr(substr($zdata,strlen($zdata) - 4),2); // fix crc bug
$fr .= pack('V',$crc); // crc32
$fr .= pack('V',$c_len); // compressed filesize
$fr .= pack('V',$unc_len); // uncompressed filesize
$fr .= pack('v',strlen($name)); // length of filename
$fr .= pack('v',0); // extra field length
$fr .= $name;// "file data" segment
$fr .= $zdata;// "data descriptor" segment (optional but necessary if archive is not
// served as file)
$fr .= pack('V',$unc_len); // uncompressed filesize// add this entry to array
$this -> datasec[] = $fr;
$new_offset = strlen(implode('',$this->datasec));// now add to central directory record
$cdrec = "x50x4bx01x02";
$cdrec .= "x00x00"; // version made by
$cdrec .= "x14x00"; // version needed to extract
$cdrec .= "x00x00"; // gen purpose bit flag
$cdrec .= "x08x00"; // compression method
$cdrec .= $hexdtime; // last mod time & date
$cdrec .= pack('V',$crc); // crc32
$cdrec .= pack('V',$c_len); // compressed filesize
$cdrec .= pack('V',$unc_len); // uncompressed filesize
$cdrec .= pack('v',strlen($name) ); // length of filename
$cdrec .= pack('v',0 ); // extra field length
$cdrec .= pack('v',0 ); // file comment length
$cdrec .= pack('v',0 ); // disk number start
$cdrec .= pack('v',0 ); // internal file attributes
$cdrec .= pack('V',32 ); // external file attributes - 'archive' bit set$cdrec .= pack('V',$this -> old_offset ); // relative offset of local header
$this -> old_offset = $new_offset;$cdrec .= $name;// optional extra field,file comment goes here
// save to central directory
$this -> ctrl_dir[] = $cdrec;
} // end of the 'addFile()' method/**
* Dumps out file
*
* @return string the zipped file
*
* @access public
*/
function file()
{
$data = implode('',$this -> datasec);
$ctrldir = implode('',$this -> ctrl_dir);return
$data .
$ctrldir .
$this -> eof_ctrl_dir .
pack('v',sizeof($this -> ctrl_dir)) . // total # of entries "on this disk"
pack('v',sizeof($this -> ctrl_dir)) . // total # of entries overall
pack('V',strlen($ctrldir)) . // size of central dir
pack('V',strlen($data)) . // offset to start of central dir
"x00x00"; // .zip file comment length
} // end of the 'file()' method} // end of the 'PHPZip' class
?>